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Fernando Pereira

@fernandopereira1

Blockchain engineer at Multiledgers who architected R3 Corda energy certificate issuance, generating BRL 600K in savings.

Brazil

Message

What I'm looking for

I'm seeking a Senior Blockchain / Backend role where I can build secure, scalable decentralized architectures.

At Multiledgers, I architected enterprise renewable energy certificate issuance using Java, Spring Boot, and R3 Corda, generating BRL 600K in self-abatement savings.

I also engineered a multi-tenant tokenization platform using Rust and Substrate for 10+ enterprise clients, expanding market liquidity by 30%. I designed Grafana dashboards to monitor blockchain infrastructure and ledger-to-frontend synchronization.

Previously, I engineered commercial invoice tokenization at Nota Registrada, driving a 30% increase in trading volume and BRL 200K in additional client revenue. At Magalu Pay, I built Java and AWS services for PIX processing millions of real-time transactions, and developed a Java routing algorithm that reduced truck loading time by 25%.

Experience

Work history, roles, and key accomplishments

Current

Blockchain Engineer

Current

Multiledgers

Mar 2022 - Present (4 years 7 months)

Architected enterprise REC issuance infrastructure using Java, Spring Boot, and R3 Corda, enabling automated green consumption verification and BRL 600K in self-abatement savings. Engineered a multi-tenant SaaS tokenization architecture for energy certificates using Rust and Substrate, delivering customizable asset issuance for 10+ enterprise clients and expanding market liquidity by 30%.

Java Spring Boot R3 Corda Rust Substrate Grafana Blockchain Tokenization SaaS Observability

Blockchain Engineer

Nota Registrada

Mar 2021 - Mar 2022 (1 year)

Engineered regulatory compliant financial services to generate CNAB400 files in Central Bank standard using Spring and SQL, which accelerated transaction processing times by 20% and minimized reporting error rates. Developed a commercial invoice tokenization for primary and secondary market trading using Java and R3 Corda, driving a 30% increase in trading volume and generating BRL 200K in additio

Java R3 Corda Spring Framework SQL CNAB400 Tokenization Financial Services

Backend Engineer

Magalu Pay

Jun 2018 - Mar 2021 (2 years 9 months)

Engineered high-throughput microservices for the Central Bank instant payment system (PIX) using Java and AWS, processing millions of real-time financial transactions with 98.9% success rate. Built a custom ML algorithm from scratch in pure Java using a Single-Layer Perceptron and Genetic Algorithms, optimizing delivery routing and reducing truck loading time by 25%.

Java AWS Microservices Pix Machine Learning Genetic Algorithms High Availability

Backend Engineer

Consigaz

Jul 2014 - Jun 2018 (3 years 11 months)

Automated individual customer gas measurement and billing workflows using Java and Spring, reducing manual accounting errors by 70% and accelerating invoice issuance from days to hours. Engineered a real-time digital contract management system using Android, enabling paperless electronic signatures via tablets and eliminating manual data re-entry with Progress ERP.

Java Spring Framework Android REST MySQL AWS EC2 Progress Software

Backend Engineer

Cielo

May 2012 - Jul 2014 (2 years 2 months)

Optimized supply chain and enterprise logistics tracking tools using Java and ActiveMQ, automating critical workflows to resolve infrastructure constraints and decreasing operational processing delays by 25%. Managed international incident response and real-time payment monitoring using Java and SQL, collaborating with global entities to cut system Mean Time to Recovery by 17%.

Java ActiveMQ SQL Incident Management Payment Systems Monitoring